The Phi Phi Islands’ southernmost islets are Koh Bida Nok and Koh Bida Nai. The larger of the two islets, Koh Bida Nok, provides excellent diving conditions for divers of all abilities. Divers typically descend into the sea from its eastern side and slowly circle the rock to the south. Zebra sharks and stingrays can be found lazing on the sand, and there is a wide diversity of marine life there. Koh Bida Nok’s northern side is ideal for wall diving. Additionally, there is a cave that should only be entered by individuals with extensive training and expertise in cave diving procedures. One of the best diving locations in Koh Phi Phi is Koh Bida Nai. Divers have thrilling swim-through opportunities via massive rock slabs that have previously fallen from the cliff, with a decent chance of seeing nudibranchs crawling on the rocks. However, Koh Bida Nai is more suited for snorkeling than Bida Nok due to the relatively shallow depth on its eastern side.